package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Blog;
import com.hmdp.entity.User;
import com.hmdp.mapper.BlogMapper;
import com.hmdp.service.IBlogService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class BlogServiceImpl extends ServiceImpl<BlogMapper, Blog> implements IBlogService {
    private final UserServiceImpl userServiceImpl;
    private final StringRedisTemplate stringRedisTemplate;

    public BlogServiceImpl(UserServiceImpl userServiceImpl, StringRedisTemplate stringRedisTemplate) {
        this.userServiceImpl = userServiceImpl;
        this.stringRedisTemplate = stringRedisTemplate;
    }


    public Result queryHotBlog(Integer current){
        // 根据用户查询
        Page<Blog> page = query()
                .orderByDesc("liked")
                .page(new Page<>(current, SystemConstants.MAX_PAGE_SIZE));
        // 获取当前页数据
        List<Blog> records = page.getRecords();
        // 查询用户
        records.forEach(blog ->{
            Long userId = blog.getUserId();
            User user = userServiceImpl.getById(userId);
            blog.setName(user.getNickName());
            blog.setIcon(user.getIcon());

            this.isBlogLiked(blog);
        });
        return Result.ok(records);
    }
    public Result queryBlogById(Long id){
        Blog blog= getById(id);
        if(blog == null){
            return  Result.fail("笔记不存在");
        }
        Long userId = blog.getUserId();
        User user = userServiceImpl.getById(userId);
        blog.setName(user.getNickName());
        blog.setIcon(user.getIcon());

        isBlogLiked(blog);
        return Result.ok(blog);
    }

    private void isBlogLiked(Blog blog) {

        UserDTO user = UserHolder.getUser();
        ;

        if(user == null)
            return;
        Long userId =  user.getId();

        String key= RedisConstants.BLOG_LIKED_KEY + blog.getId();
        Double score = stringRedisTemplate.opsForZSet().score(key, userId.toString());

        blog.setIsLike(score !=null);

    }

    public Result likeBlog(Long id){

        Long userId = UserHolder.getUser().getId();
        String key= RedisConstants.BLOG_LIKED_KEY + id;
        Double score = stringRedisTemplate.opsForZSet().score(key, userId.toString());

        if(score == null){
            boolean sucess = update().setSql("liked = liked + 1").eq("id", id).update();
            if(sucess)
                stringRedisTemplate.opsForZSet().add(key,userId.toString(),System.currentTimeMillis());
        }
        else{
            boolean sucess = update().setSql("liked = liked - 1").eq("id", id).update();
            if(sucess)
                stringRedisTemplate.opsForZSet().remove(key,userId.toString());

        }
        return Result.ok();



    }
    public Result queryBlogLikes(Long id){
        String key= RedisConstants.BLOG_LIKED_KEY + id;
        Set<String> top5 = stringRedisTemplate.opsForZSet().range(key, 0, 4);
        if(top5 ==null ||top5.isEmpty()){
            return Result.ok(Collections.emptyList());
        }


        List<Long> ids = top5.stream().map(Long::valueOf).collect(Collectors.toList());
        String idStr = StrUtil.join(",", ids);
        List<UserDTO> userDTOS = userServiceImpl.query().in("id",ids).last("order by field (id ,"+idStr+")").list()
                .stream()
                .map(user -> BeanUtil.copyProperties(user, UserDTO.class))
                .collect(Collectors.toList());
        return Result.ok(userDTOS);
    }
}
